for me, it'd probably be in the lord of the rings: the return of the king where they are in front of the black gate and completely surrounded, you hear sauron speak to aragorn, and he lowers anduril and slowly begins to walk forwards, then he turns back, blankly, to his companions, gandalf briefly and slowly waves frodo's mithril vest, before the camera zooms in on aragorn and simply says "for frodo" and charges straight into the middle of the orc hordes